Bolt and nut cover

• US 4,907,929 A
• Filed: 11/25/1986
• Issued: 03/13/1990
• Est. Priority Date: 11/25/1986
• Status: Expired due to Fees

• Current Assignee: Raymond B. Johnston Jr
• Original Assignee: Raymond B. Johnston Jr
• Inventors: Johnston, Raymond B. Jr.
• Primary Examiner(s): Wilson, Neill R.
• Application Number:
  US06/934,764
• Time in Patent Office: 1,204 Days
• Field of Search: 411/429-431, 411/373-377, 411/907, 411/908, 109/50, 109/51, 109/52
• US Class Current: 411/431
• CPC Class Codes: E01F 9/681 the sign posts being fastened by removable means, e.g. screws or bolts
• CPC Class Codes: F16B 37/14 Cap nuts; Nut caps or bolt caps
• CPC Class Codes: Y10S 411/908 Resinous material
• CPC Class Codes: Y10S 411/91 Antitamper means

Abstract

A cover for the end of a bolt to which a nut is attached is provided. The cover includes a body having an open end which is communication with an internal cavity. The internal cavity includes a first section of the shape of the nut and a second section. The second section of the internal cavity is cylindrical and is of a diameter between the outer and inner thread diameters of the bolt. In operation, the cover is forced over the bolt and nut such that the first internal cavity section surrounds the nut and the second internal cavity section engages the threads. By virtue of the interference fit provided, the cover may not readily be removed.

Claims

1. A cover for the end of a threaded bolt which extends through a nut by a predetermined distance comprising:

(a) a noncollapsible body member having a first open end which is normal to the axis of said bolt, said body comprising an outer shape in the form of a cylinder extending axially from said first end and to which there is formed a coaxial convex hemispherical surface, said body having an internal cavity extending longitudinally into said body from said first end, said cavity comprising;

(i) a first section coaxial with said bolt and of the diametrical shape of said nut and terminating in said first end; and

(ii) a second cylindrical section coaxial with said bolt and adjacent and open to said first section, said second section being of an axial depth greater than or equal to said predetermined distance and of a diameter less than the outer thread diameter of said bolt and configured to allow the threads of said bolt extending from said nut to engage the inner surface of said second cylindrical section, the inner surface of said second cylindrical section being formed from a flexible material, said first section being effective to engage said nut to prevent the rotation of said cover when said cover is applied to said bolt and said nut and said second section being effective to engage the extended portion of said bolt to prevent the axial removal of said cover from said bolt when said cover is applied to said bolt and said nut.

2. The cover of claim 1 in which said inner surface is formed from a substance which comprises polyurethane.

3. The cover of claim 1 in which said body is formed from a substance which comprises polyurethane.

4. The cover of claim 1 in which said body is formed from a substance which comprises plastic.

5. The cover of claim 1 in which said body is formed from a substance which comprises a hard rubber.

6. The cover of claim 1 in which said first section further comprises an additional cylindrical cavity area adjacent to said first end and extending into said first section substantially less than the axial height of said nut and is of a diameter greater than the maximum outer diameter of the corners of said nut.

7. The cover of claim 1 in which the inner surface of said second section is of a diameter which is greater than the inner thread diameter of said bolt.

8. The combination comprising:

(a) a threaded bolt;

(b) a nut screwedly attached to said bolt such that a predetermined length of the threads of said bolt pass through said nut; and

(c) a cover for the end of said bolt passing through said nut, said cover comprising a noncollapsible body member having a first open end which is normal to the axis of said bolt, said body comprising an outer shape in the form of a cylinder extending axially from said first end and to which there is formed a coaxial convex hemispherical surface, said body having an internal cavity extending longitudinally into said body from said first end, said cavity comprising;

(i) a first section coaxial with said bolt and of the diametrical shape of said nut and terminating in said first end; and

(ii) a second cylindrical section coaxial with said bolt and adjacent and open to said first section, said second section being of an axial depth greater than or equal to said predetermined distance and of a diameter less than the outer thread diameter of said bolt and configured to allow the predetermined length of the threads of said bolt to engage the inner surface of said second cylindrical section, the inner surface of said second cylindrical section being formed from a flexible material, said first section being effective to engage said nut to prevent the rotation of said cover when said cover is applied to said bolt and said nut and said second section being effective to engage the extended portion of said bolt passing through said nut to prevent the axial removal of said cover from said bolt when said cover is applied to said bolt and said nut.

9. The combination of claim 8 in which said inner surface is formed from a substance which comprises polyurethane.

10. The combination of claim 8 in which said body is formed from a substance which comprises polyurethane.

11. The combination of claim 8 in which said body is formed from a substance which comprises plastic.

12. The combination of claim 8 in which said body is formed from a substance which comprises a hard rubber.

13. The combination of claim 8 in which the inner surface of said second section is of a diameter which is greater than the inner thread diameter of said bolt.

14. Apparatus for securing the apertured base plate of a pole structure to a foundation comprising:

(a) an upwardly extending anchor bolt secured in said foundation and extending through the apertures in said base plate;

(b) a nut screwedly attached to said anchor bolt such that a predetermined length of the threads of said anchor bolt pass through said nut and said base plate is secured to said bolt; and

(c) a cover for the end of said anchor bolt, said cover comprising a noncollapsible body member having a first open end which is normal to the axis of said anchor bolt, said body comprising an outer shape in the form of a cylinder extending axially from said first end and to which there is formed a coaxial convex hemispherical surface, said body having an internal cavity extending longitudinally into said body from said first end, said cavity comprising;

(i) a first section coaxial with said anchor bolt and of the diametrical shape of said nut and terminating in said first end; and

(ii) a second cylindrical section coaxial with said anchor bolt and adjacent and open to said first section, said second section being of an axial depth greater than or equal to said predetermined distance and of a diameter less than the outer thread diameter of said anchor bolt and configured to allow the predetermined length of the threads of said anchor bolt to engage the inner surface of said second cylindrical section, the inner surface of said second cylindrical section being formed from a flexible material, said first section being effective to engage said nut to prevent the rotation of said cover when said cover is applied to said anchor bolt and said nut and said second section being effective to engage said extended portion of said anchor bolt passing through said nut to prevent the axial removal of said cover from said anchor bolt when said cover is applied to said anchor bolt and said nut.

15. The apparatus of claim 14 in which said inner surface is formed from a substance which comprises polyurethane.

16. The apparatus of claim 14 in which said body is formed from a substance which comprises polyurethane.

17. The apparatus of claim 14 in which said body is formed from a substance which comprises plastic.

18. The apparatus of claim 14 in which said body is formed from a substance which comprises a hard rubber.

19. The apparatus of claim 14 in which the inner surface of said second section is of a diameter which is greater than the inner thread diameter of said anchor bolt.